I don't think we are talking about the same thing actually, you seem to talk about funds/investments belonging to your couple/family while Wind_FURY and me are talking about your own funds, money that you want to keep for yourself.
But I don't have anything I want to keep from my family. What good is my money to me after I'm dead? Why would I not want my family to have access to it?
Don't you think it would be unfair that he tries to target your wife or your children instead of you, because he knows or he thinks you are the kind of guy sharing your crypto seed with his family and it will be easier to use social engineering tricks on them or worse things than that?
If someone knows enough about you to target you for your bitcoin holdings, they aren't going to care if your spouse does or does not know your wallet passwords, the location of your back ups, etc. They will be quite happy to kidnap and hit either of you until one of you tells them what they want to know.
As I said previously,
this is part of the reason I argue so strongly for good privacy. If no else knows you own bitcoin, then you are less of a target. But at the same time I trust my wife not to tell everyone she meets that we hold bitcoin, just as I trust her not to tell everyone our credit card details.